How to call imported ant target/task in Java

[M. Z.]

Hi there,
 
Can anybody advice me how to call an ant target/task, which is "<import/>"ed 
from another build file, from within Java code?
 
Here's my Java code (I got the sample from this mailing list, thanks):
---------------------------------------------
import org.apache.tools.ant.*;
import java.io.*;
import java.util.*;
 
public class MyTest
{
    private Project project;
    public void init(String _buildFile, String _baseDir) throws
Exception
    {
        project = new Project();
        try { project.init(); }
        catch (BuildException e)
            { throw new Exception("The default task list could not be loaded."
); }
        // Set the base directory. If none is given, "." is used.
        if (_baseDir == null) _baseDir=new String(".");
        try { project.setBasedir(_baseDir); }
        catch (BuildException e)
            { throw new Exception("The given basedir doesn't exist, or isn't a 
directory."); }
        if (_buildFile == null) _buildFile=new String("a.xml");
        try { ProjectHelper.getProjectHelper().parse(project, new 
File(_buildFile)); }
        catch (BuildException e)
            { throw new Exception("Configuration file "+_buildFile+" is 
invalid, or cannot be read."); }
    }

    public void runTarget(String _target) throws Exception
    {
        // Test if the project exists
        if (project == null) throw new Exception("No target can be launched 
because the project has not been initialized. Please call the 'init' method 
first !");
        // If no target is specified, run the default one.
        if (_target == null) _target = project.getDefaultTarget();
        // Run the target
        try { project.executeTarget(_target);  }
        catch (Exception e)
        { throw new Exception(e.getMessage()); }
    }
        public static void main(String args[])
      {
      try{
        
        MyTest mytest=new MyTest();         
        mytest.init("c.xml",".");         
        mytest.runTarget(null);
      }catch(Exception e)
      {
        e.printStackTrace();
      }
  }
}
---------------------------------------------
 
Here's my build files:
1.c.xml:
<project basedir="." default="runtests" name="TestC">
<import file="a.xml"/>
</project>
 
2. a.xml:
<project basedir="." default="runtests" name="TestA">
<target name="runtests" depends="">
<mkdir dir="ttt"/>
</target>
</project>
 
--------------------------------------
If I directly set build file "a.xml" in MyTest.java, everthing works well. 
However, if I set "c.xml" then do task "<mkdir dir="ttt"/>" defined in "a.xml" 
which was imported by "c.xml", when running, I got an exception. Looks like it 
can't parse my c.xml which include "import". BTW, I'm using ant 1.6.2, and 
running "ant -f c.xml" was ok.
 
Did I miss any classpath or something? Any idea?
 
Thanks,
Amy


                
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